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Questions remain over American hostage Kayla Mueller

/ Source: TODAY

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U.S. officials continue to say that there is still no evidence corroborating claims made by ISIS that American Kayla Mueller was killed in an air strike. The 26-year-old aid worker and Arizona native was kidnapped near Aleppo in August of 2013 while helping Syrian refugees.

This story was originally published on Feb. 6 at 2:54 p.m. ET.

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